Almost every country celebrates its independence from someone else. It just happens that we Americans did it in such a successful way and have come so far in so little time.
Here in Greece we celebrate our independence form the Turks on March 25 and our refusal to allow the Italians to take over in WWII on October 28 -- the OXI that was heard round the sweater world and gave courage to all of Europe! So, basically, we celebrate twice.
I'm proud to be both an American and a Greek. I belong to the two nations who have given the most to the world!